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EN8M Bright Bars is an important type of free cutting steel that has
made its way into the market. These are widely used by several
industries for the use in the production of the above mentioned
instruments and parts. As this type of steel forms chips when it is
worked on, they can take up only an average amount of heavy duty items
at a time. When they are sold in the market, the grade of the free
cutting varies with its composition. Sulphur or phosphorous are the
two main types of ingredients that are added to the steel, apart from
some little amounts of carbon.
EN8M type of free-cutting steel in Bright Bars has Sulphur added to it
with a medium amount of carbon. They are mostly round or hexagonal in
shape. These bars are used for making shafts, gears, studs, pins and
Bright Bars have found usage at a very wide scale, extending quality
construction finish, anti-corrosive properties, and high durability.
These bars are used for making shafts, gears, studs, pins and gears.
Addition to other grades:
MS, EN1A, EN3B, EN8, EN8D, EN9, EN19, EN24, EN31, EN32B, EN36C, EN41B,
EN43B, EN47, EN353, IS2062, 42Crmo4, HCHCR, D2, D3, H-11, H-13, CW-1,
OHNS, M2, M35, M42, 2714, SKD-11, P20, P20+S, P20+Ni, SCM 420, ASTM
SA-36, ASTM SA-105, SAE 1018, SAE 1020, SAE 4140, SAE 8620, 16MNCR5,
20MNCR5, C20, C35, C40, C45, C50, C60, CK45, 20C8, 40C8, 45C8, 55C8,
C55MN75, SAE 52100, S40C, S355J2G3.
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The following table shows the chemical composition of EN8M steel:
||0.35 – 0.45
||1.00 – 1.30
|Hardness, Brinell (typical)
|Hardness, Rockwell C (typical)
|Tensile strength, ultimate
|Tensile strength, yield
|Elongation at break (in 50 mm (2″))
|Charpy impact (V-Notch)
Heat treatment temperatures, including rate of heating, cooling and
soaking times will vary due to factors such as the shape and size of
each EN8M steel component. Other considerations during the heat
treatment process include the type of furnace, quenching medium and
work piece transfer facilities.
Heat the component slowly to 820-860°C and allow it to be heated
through. Quench in oil or water.
Temper the EN8M component immediately after quenching whilst tools are
still hand warm. Re-heat the EN8M component to the tempering
temperature then soak for one hour per 25 millimeter of total
thickness (2 hours minimum) Cool in air. For most applications
tempering of EN8M will be between 550-660°C.
Preheat the steel carefully, then raise temperature to 1050°C for
forging. Do not forge below 850°C. After forging cool slowly,
preferably in a furnace.
Heat slowly to 680-710°C, soak well. Cool slowly in the furnace.
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